Bhishma was an invincible warrior. He was also a highly skilled in political science. He had all the qualities and abilities for an excellent king. His goodness and sacrifice made him one of the greatest devotees of Lord Krishna himself. He tried his best to bring reconciliation between the Pandavas and Kauravas to prevent the war. Even in the Kurukshetra war, while he was the general, he tried his best to keep the war low key by minimizing confrontation between the two camps. Even as he fell he tried to use the opportunity to persuade both camps to put an end to the war. Bhishma was a complete human, a complete warrior and a complete teacher (acharya), hence he was known as Bhishmacharya.